Sennheiser HD-650, Headphones, Dynamic, Open, Impedance: 300 Ohm, Sound pressure level: 103 dB, Frequency range: 10 - 41,000 Hz, 3 m Cable with 6.3 mm stereo jack plug, Weight without cable: 269 g, Weight with cable: 346 g, Includes 20 cm adapter cable from 6.3 mm to 3.5 mm jack plug